INOTECTM PROMOTOR

IMPROVING THE HUMIDITY RESISTANCE OF
INORGANIC BINDERS WITH INOTECTM
PROMOTERS OF THE 6TH GENERATIONThe INOTECTM technology has established itself worldwide as an environmentally friendly and highly productive
core manufacturing process for the production of cast
light metal components and has become an
indispensable part of today‘s production processes forvarious automotive powertrains.
Due to the increasing demands with regard to process
stability and quality in the series production process,performance requirements on inorganic binders areconstantly rising. A key performance indicator is thehumidity resistance of the cores, which is characterized
by the retention of flexural strength and the absorption ofmoisture during core storage, but also by the absorptionof moisture from cast core packages up until raw partmachining. The excellent break down
properties of the cores after casting increase process
stability, since reactivation of the binder system is slowed
down by the reduced moisture absorption.
The new 6th generation INOTECTM promoters enable animproved moisture stability and also offer further
technological advantages.
TECHNOLOGICAL ADVANTAGES▪

Increased material efficiency due to lower addition
rates

▪

Optimized humidity resistance (improved strength
retention and reduced moisture absorption)
during core storage▪

Variable thermal stability depending on thesand core geometry▪

Process-reliable brake down properties for raw
part machining

INOTECTM PROMOTOR

Figure 1: Absolutes
Strength (bar) and moisturedevelopment (line) for
inorganic-bonded sand coresbased on INOTECTM 4th (darkblue) and 6th generation (lightblue) promoters.

INOTECTM promoters (6th generation)
The 6th generation INOTECTM promoters improves themoisture stability of inorganic-bound sand cores as a key
performance characteristic of the powdered bindercomponent. The moisture stability of inorganically bonded
sand cores can be monitored by determining the strengthand moisture content during core storage at high absolutehumidity. The moisture at 600 °C is determined in orderto record all of the water bound in the sand core. Figure 1
shows the development of the two parameters „Strength“(bars and left scale) as well as „Humidity 600 °C“ (dashedlines and right scale) of both the 4th and 6th promoter
generations as a function of storage time at an absolute
humidity of approx. 18 g water/m3 air (30 °C, 60 % relativehumidity).
The concept of thermal stability has been incorporated
unchanged in the promoter components of the provenmodular system. Thermal stability describes the resistanceof the binder system to mechanical and thermal influencesof the casting applications. In this context, the INOTECTM
Promoter WJ 6500 exhibits exceptionally high thermalstability, which counteracts deformation especially of filigree
and thermally stressed core geometries, such as water
jacket cores, during casting applications. In contrast, theINOTECTM Promoter TC 6500 has low thermal stability andis suitable for the production of voluminous coregeometries e.g. cover cores. The complementary promoter
components can be mixed in any ratio, so that a specificthermal stability can be set in dependence on the sandcore geometry (Figure 2).
In addition to these sand core-specific properties, a
reduced usage rate for 6th generation promoters and thusincreased material efficiency should also be highlighted.
In addition, the use of the latest generation of promoters
optimizes landfill costs for sand disposal.

Figure 2: Comparison of thermal stability

YOUR SUSTAINABILITYPLUS
Economic aspects▪ Reduced landfill costs for sand disposal
Environment & Social▪ Emission-free in core production, storage andcasting application, thanks to being 100 %inorganic